Adjustable cam.



- W. S. HENRY.

ADJUSTABLE CAM. APPLICATION FILED'DEC. 1.19M.

1,162,693. Patented-Nov. 30, 1915.

FIG-.1.

INVENTOR.

' gka ma. KW 14% WILLIAM S. HENRY. OF ROCHESTER, NEW YORK, ASSIGNO-R rarer Fries.

'IO GENERAL RAILWAY SIGNAL COMPANY, OF GATES NEW YORK,'A CORPORATION OF NEW YORK.

ADJUSTABLE CAM.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed December 1, 1914. Serial No. 875,034.

To aZZ 207mm 2'13 may concern:

Be it known that I, VILLiAiI-S. Hnxry, a citizen of the United of the city of Rochester, in the county of -Monroe and State of New York, have inand which can be locked and held firmly in the adjusted position.

'Other objects and advantages will appear as the description of the invention progresses, and the novel features of the invention will be particularly pointed out in the appended claims.

In describing the invention in detail, reference is had to the accompanying drawing wherein I have illustrated a preferred physical embodiment of my invention, and wherein like characters of reference designate similar parts throughout the several views, and in which:

Figure l is a sectional view taken through the middle of the cam in a plane perpendic-' ular to the driving shaft; Fig. 2, is a cross section of the cam on the line E F, Fig. 1, looking in the direction of the arrows.

Referring to the drawing, letter adcsignates a driving shaft which may be supported in suitable bearings and provided with any suitable means adapted to cause the shaft to turn. Two collars b and toothed wheel 0 are rigidly fastened to the shaft and a cam (Z, havingv sides 0 and an operating surface f, is revolubly supported on the collars Z). A pin 9 egtends through the cam parallel to the shaft (4 and is secured rigidly to the opposite sides of the cam; An arm la is disposed for the most part within the cam and is journaled on pin 9 and formed with a cavity 7' and has an-extendinglug 7c. The arm h is formed with holes Z and m which form bearings in which a shaft a is journaled." The outer formed with a screw driver slot therein, said slot sert'ing as a means for causing the shaft or to turn. A worm-wheel 0 is rigidly fastened to the shaft 72 and is located in cavity j, which has a screw thread on its'periphery which meshes with teeth on the periphery States, and a resident end of the shaft n is- The cam (Z has an of the toothed wheel 0.

p which is adjacent to lug Z;

extending lug on the arm 71. and lo *ated so there is a space between the lugs. Each lug is formed with a hole, said holes being in alinement. A bolt 7 extends through the holes in the lugs and has a head .on one end adjacent lug The bolt is provided with screw threads on the other end adapted to receivenuts 1'.

By. tightening the nuts '2' the lug L will be forced to move nearer lug p and the arm It will move toward the shaft a causing the thread on worm-wheel 0 to be forced tightly into engagement with the teeth on wheel 0, thereby holding the arm it, worm-wheel 0 and cam (Z rigidly movement relative to the shaft.

To adjust the position of the cam rela-' tively to the shaft the nuts are loosened and x the shaft n is turned by inserting a screw driver in the slot 8, thus causing the thread 011 worm-wheel 0 to be turned in the teeth of wheel 0, causing worm-wheel 0, arm it and cam (Z to be turned on the shaft a.

"The arm 71. is formed so that the distance between the surface 2. and the inside surface 21. of the cam is less than the depth of the teeth on wheel 0. Arm it, therefore, cannot be moved far enough from wheel 0 to allow the thread on worm-wheel 0 to clear the top of the teeth on the wheel 0. \Vhen the nuts 1 are loosened the arm h and cam (Z cannot be moved through an angular distance greater than the pitch of the teeth on wheel c. This movement on the shaft can be made insignificant by providingteeth on wheel 0 of extremely small pitch. Therefore, if a person should fail to lock the cam, it would be incapable of movement relative to the shaft except through a small angular distance which is less-than the pitch of the teeth on wheel 0.

l The applicant has provided a locking device which will cause the cam to retain its adjustment, which looks the cam firmly to the driving shaft, and which, if left unlocked on account of neglect or carelessness, would 'still prevent movement of the cam relative to the shaft, except through a very small distance, which can be made insignificant.

Although I have particularly described the construction of one physical embodiment of my invention, and explained the operation and principle thereof; nevertheless,

and incapable of rotative I desire to have it understood that the form selected l'simerely illustrative, but does not i exhaust the possible physical embodiments of the ideaiof means underlying my inventlon. I

WhatI claim as new and'deslre to secure by- Letters Patent of the United States is":

1. Adjustable cam mechanism comprising relatively rotatable members, intermeshing worm and toothed elements carried by said 1 respective members, and means for changing the relation of the axes of said elements,

whereby said elements may be clamped into locked relationship. v 2. Adjustable cam mechanism comprising relatively movable concentric members, a

relatively movable concentric members, one

' membenhaving an arcuate toothed portion,

and a worm-shaft pivotally secured to the other member and having a worm meshing relatively movable concentric members, the

with said toothed portion.

4. Adjustable cam mechanism comprising relatively movable concentric members, one member having an arcuate toothed portion, a worm-shaft pivotally secured to the other -memb'er'- and having a worm meshing with said toothed portion, and means for clamping said'worm tightly against said toothed,

portion.

5. Adjustable cam mechanism comprising relatively movable concentric members, the

inner member being provided with an arcuate toothed P01131011, an arm pivotally mounted upon the other member, and a shaft rotatably carried by said arm and having a wormgear meshing with said toothed pora shaft rorelatively movable members, one of which isprovided with a friction or hearing surface and the other being adapted to be fixed cam mechanism comprising by said arm and having aan arm pivotally to a shaft, said fixed member having a" toothed portion, a Worm shaft carried by the other member and meshing with said toothed portion, and means for tightening the worm in a direction transversely thereof against the toothed portion.

8. Adjust ble cam mechanism comprising inner member having a toothed periphery, the outer member forming a housing and inclosing the inner member, an arm pivotally mounted within said outer member, a worm shaft carried by said arm and meshing with said toothed periphery, and means for clamping said arm to said outer member.

WILLIAM S. HENRY. Witnesses:

SOPHIE LEVIN, LORETTA M. Srmss. 

